Data transmission method and system, and related devices

ABSTRACT

A data transmission method is performed at a data transmission system, including: receiving, by a transit device, audio/video data sent by a target client terminal that is in a target communication channel and has an audio/video upstream authority; forwarding, by the transit device, the audio/video data to a broadcast proxy device in the target communication channel, the broadcast proxy device being connected to at least one second client terminal that is in the target communication channel and does not have an audio/video upstream authority; and forwarding, by the broadcast proxy device, the audio/video data to each second client terminal in a corresponding downstream transmission mode according to network quality information of the second client terminal, the network quality information of each second client terminal being collected by the broadcast proxy device in advance.

RELATED APPLICATIONS

This application is a continuation of U.S. application Ser. No.15/709,283, entitled “DATA TRANSMISSION METHOD AND SYSTEM AND RELATEDDEVICE” filed on Sep. 19, 2017, which is a continuation-in-partapplication of PCT/CN2016/083482, entitled “DATA TRANSMISSION METHOD ANDSYSTEM AND RELATED DEVICE” filed on May 26, 2016, which claims priorityto Chinese Patent Application No. 201510543206.3, filed with the StateIntellectual Property Office of the People's Republic of China on Aug.28, 2015, and entitled “DATA TRANSMISSION METHOD AND SYSTEM AND RELATEDDEVICE”, all of which are incorporated herein by reference in theirentirety.

FIELD OF THE TECHNOLOGY

The present disclosure relates to the field of internet technology, andin particular, to a data transmission method and system, and relateddevices.

BACKGROUND OF THE DISCLOSURE

With prosperity and development of services such as online education,show anchoring, and live games, a real-time multi-person audio and videocall service backend also bears an increasing load. For example, areal-time multi-person audio and video call service based on IM/socialtool group membership has a good real-time capability and featuresdelicate network quality control. However, in the service, a networkcontrol policy system usually needs to perform a large amount ofcentralized real-time calculation according to the status of eachparticipate user, and resource consumption increases linearly withincrease of a quantity of the participate users. Secondary, to guaranteegood call experience, usually there are frequent broadcast notifications(such as in and out of a person skilled in the art, switch of videoresource, and up/down microphone) in such the type of service, andusually expansion in the scale of an audio/video room also indicateslinear increase of the quantity of the notifications. Finally, fullamount/incremental data synchronization usually needs to be maintainedbetween the network control policy system and a data forwarding system,so as to guarantee consistency of user state information in the room insuch the type of service. Therefore, a backend performance bottle isextremely apt to appear in a super large scale audio/video room. Inparticular, when a local fault appears, a centralized broadcast effectin the super large scale audio/video room may further expand the rangeof affect by the fault, resulting in service instability of the wholesystem.

SUMMARY

Embodiments of the present disclosure provide a data transmission methodand system, and related devices, capable of guaranteeing stability of asuper large scale audio/video call service system.

A first aspect of the present disclosure provides a data transmissionmethod performed at data transmission system including a transit deviceand a broadcast proxy device that is communicatively coupled to thetransit device, each device having one or more processors and memorystoring one or more programs to be executed by the one or moreprocessors, the method, including:

receiving, by the broadcast proxy device, audio/video data sent by thetransit device, the audio/video data being data sent to the transitdevice by a target client terminal that is in a target communicationchannel and has an audio/video upstream authority, and at least onesecond client terminal that is in the target communication channel anddoes not have an audio/video upstream authority being connected to thebroadcast proxy device;

forwarding, by the broadcast proxy device, the audio/video data to eachsecond client terminal in a corresponding downstream transmission modeaccording to network quality information of the second client terminalof the at least one second client terminal, the network qualityinformation of the second client terminal being collected by thebroadcast proxy device in advance; and

the transit device being a device configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority and tothe broadcast proxy device in the target communication channel.

A second aspect of the present disclosure provides a data transmissionsystem including a transit device and a broadcast proxy device that iscommunicatively coupled to the transit device, each device having one ormore processors, memory and one or more programs stored in the memorythat, when executed by the one or more processors, cause the datatransmission system to perform the aforementioned data transmissionmethod.

A third aspect of the present disclosure provides a non-transitorycomputer readable storage medium storing one or more programs, whereinthe one or more programs, when executed by a data transmission systemcomprising a transit device and a broadcast proxy device that iscommunicatively coupled to the transit device, cause the datatransmission system to perform the aforementioned data transmissionmethod.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

BRIEF DESCRIPTION OF THE DRAWINGS

To describe the technical solutions of the embodiments of the presentdisclosure or the existing technology more clearly, the followingbriefly introduces the accompanying drawings required for describing theembodiments or the existing technology. Apparently, the accompanyingdrawings in the following description show only some embodiments of thepresent disclosure, and a person of ordinary skill in the art may stillderive other drawings from these accompanying drawings without creativeefforts.

FIG. 1 is a schematic diagram of a network architecture according tosome embodiments of the present disclosure;

FIG. 2 is a schematic flowchart of a data transmission method accordingto some embodiments of the present disclosure;

FIG. 3 is a schematic timing diagram of a data transmission methodaccording to some embodiments of the present disclosure;

FIG. 4 is a schematic flowchart of another data transmission methodaccording to some embodiments of the present disclosure;

FIG. 5 is a schematic flowchart of still another data transmissionmethod according to some embodiments of the present disclosure;

FIG. 6 is a schematic flowchart of still another data transmissionmethod according to some embodiments of the present disclosure;

FIG. 7 is a schematic structural diagram of a transit device accordingto some embodiments of the present disclosure;

FIG. 8 is a schematic structural diagram of a transit device accordingto some embodiments of the present disclosure;

FIG. 9 is a schematic structural diagram of still another transit deviceaccording to some embodiments of the present disclosure;

FIG. 10 is a schematic structural diagram of a broadcast proxy deviceaccording to some embodiments of the present disclosure;

FIG. 11 is a schematic structural diagram of another broadcast proxydevice according to some embodiments of the present disclosure;

FIG. 12 is a schematic structural diagram of still another broadcastproxy device according to some embodiments of the present disclosure;and

FIG. 13 is a schematic structural diagram of a data transmission systemaccording to some embodiments of the present disclosure.

DESCRIPTION OF EMBODIMENTS

The following clearly and completely describes the technical solutionsin the embodiments of the present disclosure with reference to theaccompanying drawings in the embodiments of the present disclosure.Apparently, the described embodiments are some of the embodiments of thepresent disclosure rather than all of the embodiments. All otherembodiments obtained by a person of ordinary skill in the art based onthe embodiments of the present disclosure without creative efforts shallfall within the protection scope of the present disclosure.

To better understand the data transmission method and system, andrelated devices according to the embodiments of the present disclosure,the following first describes a network architecture applicable to theembodiments of the present disclosure. Referring to FIG. 1, FIG. 1 is aschematic diagram of a network architecture according to someembodiments of the present disclosure. As shown in FIG. 1, the networkarchitecture may include a policy service device, a flow control enginedevice, a plurality of transit devices, a plurality of broadcast proxydevices, and a plurality of clients. The policy service device maycommunicate with the flow control engine device through a network. Theflow control engine device may communicate with the plurality of transitdevices and the plurality of broadcast proxy devices through a network.The plurality of transit devices may communicate with the plurality ofbroadcast proxy devices through a network. The plurality of transitdevices may be connected to a client terminal that has an audio/videoupstream authority through a network. The plurality of broadcast proxydevices may be connected to a client terminal that does not have anaudio/video upstream authority through a network. The client terminalthat has an audio/video upstream authority is a client capable ofuploading data. The client terminal that does not have an audio/videoupstream authority is a client incapable of uploading data. Each transitdevice manages and maintains a plurality of audio/video call channels(that is, a plurality of audio/video rooms). Different transit devicesmay manage and maintain the same audio/video call channel. Eachbroadcast proxy device also manages and maintains a plurality ofaudio/video call channels. Different broadcast proxy devices may manageand maintain the same audio/video call channel. One audio/video callchannel may include at least one transit device, at least one broadcastproxy device, at least one client terminal that has an audio/videoupstream authority, and at least one client terminal that does not havean audio/video upstream authority. The policy service device is incharge of operations such as allocation of room numbers and accessaddresses of data forwarding services, and security check. The flowcontrol engine device is in charge of operations such as roommanagement, user flow control and calculation in a room, and datasynchronization. Each transit device also stores a broadcast proxydevice list corresponding to each audio/video call channel maintained bythe transit device. The broadcast proxy device list includes informationof a broadcast proxy device in the corresponding audio/video callchannel. The broadcast proxy device list stored in each transit devicemay be synchronized and updated by the flow control engine device. In anactual application, when one client among the clients connected to thetransit devices uploads audio/video data, a transit device connected tothe client may forward the audio/video data to another transit devicethat is in the same audio/video call channel, and forward theaudio/video data to each broadcast proxy device in the same audio/videocall channel, so that the transit devices in the same audio/video callchannel may further respectively forward the audio/video data to clientsthat are connected to the transit devices and in the same audio/videocall channel, and that the broadcast proxy devices in the sameaudio/video call channel may further respectively forward theaudio/video data to clients that are connected to the broadcast proxydevices and in the same audio/video call channel.

Referring to FIG. 2, FIG. 2 is a schematic flowchart of a datatransmission method performed at data transmission system including atransit device and a broadcast proxy device that is communicativelycoupled to the transit device according to some embodiments of thepresent disclosure. The method may include:

S101: A transit device receives audio/video data sent by a target clientterminal that is in a target communication channel and has anaudio/video upstream authority.

Specifically, a transit device may receive audio/video data sent by atarget client terminal that is in a target communication channel and hasan audio/video upstream authority. The transit device may be a transitdevice in the network structure corresponding to FIG. 1. The targetclient terminal may be a client of a plurality of clients that isconnected to the transit device, is in the same target communicationchannel, and has an audio/video upstream authority. The targetcommunication channel is a client of at least one audio/video callchannel.

S102: The transit device forwards the audio/video data to at least onefirst client terminal that is in the target communication channel andhas an audio/video upstream authority, and to a broadcast proxy devicein the target communication channel, the broadcast proxy device beingconnected to at least one second client terminal that is in the targetcommunication channel and does not have an audio/video upstreamauthority.

Specifically, after the transit device receives the audio/video data,the transit device may forward the audio/video data to at least onefirst client terminal that is in the target communication channel andhas an audio/video upstream authority. The process of forwarding, by thetransit device, the audio/video data to the at least one first clientterminal specifically includes: forwarding, by the transit device and ina downstream transmission mode notified by the flow control enginedevice, the audio/video data to the at least one first client terminalthat is connected to the transit device, is in the target communicationchannel, and has an audio/video upstream authority, and to an associatedtransit device, so that the associated transit device forwards theaudio/video data to at least one first client terminal that is connectedto the associated transit device, is in the target communicationchannel, and has an audio/video upstream authority, the associatedtransit device including another transit device in the targetcommunication channel apart from the transit device. The transit devicealso forwards the received audio/video data to a broadcast proxy devicein the target communication channel. At least one second client terminalthat is in the target communication channel and does not have anaudio/video upstream authority is connected to the broadcast proxydevice. The downstream transmission mode notified by the flow controlengine device to the transit device and the associated transit device isdetermined according to network quality information of the at least onefirst client terminal collected in advance. For example, the transitdevice and the associated transit device may directly forward completeaudio/video data to a first client terminal in a relatively smoothnetwork, or may also forward the audio/video data to a first clientterminal in a network having weak signals by means of frame skip. Thenetwork quality information may include statistics information such as apacket loss rate and delay information. There may be a plurality of theassociated transit devices and a plurality of the broadcast proxydevices.

Before operation S101, the method further includes:

The transit device receives a first access request sent by the targetclient terminal, and completes connection with the target clientterminal according to the first access request, the first access requestbeing generated by the target client terminal according to an address ofthe transit device allocated by the policy service device, and theaddress of the transit device being allocated by the policy servicedevice when the policy service device detects that the target clientterminal has an audio/video upstream authority.

The broadcast proxy device receives a second access request sent by eachsecond client terminal and completes connection with each second clientterminal according to the second access request, the second accessrequest being generated by each second client terminal according to anaddress of the broadcast proxy device allocated by the policy servicedevice, and the address of the broadcast proxy device being allocated bythe policy service device when the policy service device detects thateach second client terminal does not have an audio/video upstreamauthority. The address of the transit device obtained by the at leastone first client terminal connected to the transit device is alsoallocated by the policy service device. The address of the associatedtransit device obtained by the at least one first client terminalconnected to the associated transit device is also allocated by thepolicy service device.

S103: The broadcast proxy device forwards the audio/video data to eachsecond client terminal in a corresponding downstream transmission modeaccording to network quality information of the second client terminal,the network quality information of each second client terminal beingcollected by the broadcast proxy device in advance.

Specifically, after the transit device sends the audio/video data to thebroadcast proxy devices in the target communication channel, eachbroadcast proxy device in the target communication channel mayrespectively send, in a corresponding downstream transmission modeaccording to the network quality information corresponding to eachsecond client terminal, the audio/video data to each second clientterminal connected to the broadcast proxy device. For example, it isassumed that a second client terminal A and a second client terminal Bare connected to one broadcast proxy device in the target communicationchannel. If the broadcast proxy device senses that the network of thesecond client terminal A is relatively smooth, the broadcast proxydevice may forward complete audio/video data to the second clientterminal A. Meanwhile, if the broadcast proxy device senses that thenetwork of the second client terminal B is not stable, the broadcastproxy device may forward audio/video data to the second client terminalB by means of frame skip. The broadcast proxy device may collect networkquality information of each second client terminal regularly. As thenetwork quality information of each second client terminal is reportedto the broadcast proxy device and the flow control engine device needsto collect only network quality information of the first client terminaland the target client terminal, load of the flow control engine devicecan be further alleviated.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Further referring to FIG. 3, FIG. 3 is a schematic timing diagram of adata transmission method according to some embodiments of the presentdisclosure. In this embodiment of the present disclosure, the specificprocess of the data transmission method is illustrated from the sides ofa transit device, a broadcast proxy device, a flow control enginedevice, a first client terminal, a second client terminal, and a targetclient terminal together.

S201: The target client terminal sends audio/video data to the transitdevice.

Specifically, the target client terminal may be a client terminal thatis in the target communication channel and has an audio/video upstreamauthority. The target client terminal is connected to the transitdevice. The transit device may be a transit device in the networkstructure corresponding to FIG. 1. The target client terminal may be aclient in a plurality of clients that is in the target communicationchannel and has an audio/video upstream authority. The targetcommunication channel is a client of at least one audio/video callchannel.

S202: The transit device forwards the audio/video data to the firstclient terminal.

Specifically, after the transit device receives the audio/video data,the transit device may forward the audio/video data to at least onefirst client terminal that is in the target communication channel andhas an audio/video upstream authority. The process of forwarding, by thetransit device, the audio/video data to the at least one first clientterminal specifically includes: forwarding, by the transit device and ina downstream transmission mode notified by the flow control enginedevice, the audio/video data to the at least one first client terminalthat is connected to the transit device, is in the target communicationchannel, and has an audio/video upstream authority, and to an associatedtransit device, so that the associated transit device forwards theaudio/video data to at least one first client terminal that is connectedto the associated transit device, is in the target communicationchannel, and has an audio/video upstream authority, the associatedtransit device including another transit device in the targetcommunication channel apart from the transit device. The downstreamtransmission mode notified by the flow control engine device to thetransit device and the associated transit device is determined accordingto network quality information of the at least one first client terminalcollected in advance. For example, the transit device and the associatedtransit device may directly forward complete audio/video data to a firstclient terminal in a relatively smooth network, or may also forward theaudio/video data to a first client terminal in a network having weaksignals by means of frame skip. There may be a plurality of associatedtransit devices.

S203: The transit device forwards the audio/video data to the broadcastproxy device.

Specifically, operation S203 and operation S202 may be performedsynchronously. That is, the transit device may also forward theaudio/video data to the broadcast proxy device while forwarding theaudio/video data to the first client terminal. At least one secondclient terminal that is in the target communication channel and does nothave an audio/video upstream authority is connected to the broadcastproxy device. There may be a plurality of the broadcast proxy devices.

S204: The broadcast proxy device forwards the audio/video data to thesecond client terminal.

Specifically, after the transit device sends the audio/video data to thebroadcast proxy devices in the target communication channel, eachbroadcast proxy device in the target communication channel mayrespectively send, in a corresponding downstream transmission modeaccording to the network quality information corresponding to eachsecond client terminal, the audio/video data to each second clientterminal connected to the broadcast proxy device. For example, it isassumed that a second client terminal A and a second client terminal Bare connected to one broadcast proxy device in the target communicationchannel. If the broadcast proxy device senses that the network of thesecond client terminal A is relatively smooth, the broadcast proxydevice may forward complete audio/video data to the second clientterminal A. Meanwhile, if the broadcast proxy device senses that thenetwork of the second client terminal B is not stable, the broadcastproxy device may forward audio/video data to the second client terminalB by means of frame skip. The broadcast proxy device may collect networkquality information of each second client terminal regularly. As thenetwork quality information of each second client terminal is reportedto the broadcast proxy device and the flow control engine device needsto collect only network quality information of the first client terminaland the target client terminal, load of the flow control engine devicecan be further alleviated.

S205: The flow control engine device sends a redirection instruction tothe broadcast proxy device when there is a second client terminal forwhich an audio/video upstream authority is allocated among the secondclient terminals.

S206: The broadcast proxy device transfers an access service of thechanged second client terminal to the transit device according to theredirection instruction.

Specifically, operation S205 and operation S206 may be performed at anytime. When it is detected that there is a second client terminal forwhich an audio/video upstream authority is allocated among the pluralityof second client terminals, the flow control engine device sends aredirection instruction to the broadcast proxy device, so that thebroadcast proxy device transfers, according to the redirectioninstruction, an access service of the changed second client terminal tothe transit device, and the transit device may establish a connectionrelationship with the changed second client terminal. The broadcastproxy device itself does not have an upstream data forwarding function,a user of the broadcast proxy device needs to be redirected to a datatransit device when the user of the broadcast proxy device acquires anupstream data authority (in scenarios such as anchor microphone control,and roll call by a teacher and question answering by a student). Forexample, a first client terminal is a user “teacher”, and a secondclient terminal is a user “student”. When the user “teacher” wants tocall the name of the user “student” to answer a question, the firstclient terminal may send a message to instruct the flow control enginedevice to send a redirection instruction to a broadcast proxy device towhich the second client terminal is connected, so as to enable theaudio/video upstream authority of the second client terminal andreconnect the second client terminal to a corresponding transit device.The implementation manner of redirecting the second client terminal mayinclude: the second client terminal again performs the process of policyapplication, allocation, and access, or a backend finds the informationand puts the information in the redirection instruction in advance. Nomatter which implementation manner is used, the flow control enginedevice needs to acquire an authority of the redirected user from theservice backend and allocates a suitable access service according to theauthority of the user. In the present disclosure, not only the secondclient terminal can be redirected to the transit device, but also thefirst client terminal/target client terminal can be redirected to thebroadcast proxy device.

The redirection process is not sensible for the user. That is, theredirected first client terminal/second client terminal/target clientterminal needs to hide the redirection process by means of smoothprocessing. For example, the second client terminal does not disconnecta channel with the broadcast proxy device until a channel with thetransit device is established and data can be sent and received by meansof the channel with the transit device.

S207: The broadcast proxy device reports to the flow control enginedevice a total quantity of second client terminals after change, after atotal quantity of the second client terminals changes.

S208: The flow control engine device calculates a total quantity ofclient terminals in the target communication channel.

Specifically, operation S207 and operation S208 may be performed at anytime. When the total quantity of the second client terminals changes, itindicates that a new second client terminal has accessed the broadcastproxy device, or a second client terminal is disconnected from thebroadcast proxy device. In this case, the broadcast proxy device mayreport to the flow control engine device the total quantity of secondclient terminals after change, so that the flow control engine devicemay calculate the total quantity of client terminals in the targetcommunication channel according to the reported total quantity of secondclient terminals, the total quantity of the target client terminals andthe first client terminals. That is, the total quantity of clientterminals in the target communication channel is the sum of thequantities of the second client terminals, the first client terminals,and the target client terminals. By using the reported total quantity ofsecond client terminals after change, the flow control engine device maybe enabled to sense a change in a total quantity of individuals in thetarget communication channel.

S209: The flow control engine device sends client change information tothe broadcast proxy device when the audio/video upstream authority ofthe target client terminal is canceled, or the first client terminalstarts to upload the audio/video data, or the changed second clientterminal starts to upload the audio/video data.

S210: The flow control engine device sends the client change informationto the transit device.

S211: The transit device forwards the client change information to thefirst client terminal.

S212: The transit device forwards the client change information to thetarget client terminal.

S213: The broadcast proxy device forwards the client change informationto the second client terminal.

Specifically, operation S209 to operation S213 may be performed at anytime. When the audio/video upstream authority of the target clientterminal is canceled, or the first client terminal starts to upload theaudio/video data, or the changed second client terminal starts to uploadthe audio/video data, the flow control engine device may send the clientchange information to the broadcast proxy device and the transit devicein the target communication channel, so that the broadcast proxy devicemay forward the client change information to the target client terminal,the first client terminal and the changed second client terminal, andthat the target client terminal, the first client terminal and thechanged second client terminal may learn about the status of a clientterminal that has an audio/video upstream authority in the targetcommunication channel. The changed second client terminal may be thechanged second client terminal in operation S205 and operation S206. Theclient change information may include at least one of information aboutthe target client terminal of which the audio/video upstream authorityis canceled, information about the first client terminal that starts toupload the audio/video data, and information about the changed secondclient terminal that starts to upload the audio/video data. The flowcontrol engine device may also send the client change information to anassociated transit device, so that the associated transit device alsoforwards the client change information to the first client terminal thatis connected to the associated transit device. For example, when a userthat only performs listening/watching (that is, the second clientterminal) acquires an authority of uploading data, completesredirection, and actually starts to upload audio/video data by means ofthe transit device, the flow control engine device needs to broadcastthe client change information in an audio/video call room (that is, thetarget communication channel) where the user is, so as to notify allusers in the audio/video call room of the client change information, sothat all of the users are informed of that there is new audio/video datafor subscription. The specific broadcast manner is: the flow controlengine device sends the client change information to the correspondingtransit device and the corresponding broadcast proxy device, so that thecorresponding transit device and the corresponding broadcast proxydevice further forward the client change information to thecorresponding clients. Optionally, the subscription operation may beskipped. New upstream data is directly pushed to all of the clients inthe audio/video call room, so that all of the clients sense a new datasource according to a change in the data. Still for example, when thereis a target client terminal currently uploading audio/video data nolonger uploads data due to reasons such as canceling of the audio/videoupstream authority or disconnecting of connection, the flow controlengine device is responsible for broadcasting the client changeinformation to all of the users in the target communication channel(including the first client terminals, the second client terminals, andthe target client terminal), so that the clients give friendly promptsto the users.

Optionally, notifications of the status of the first client terminal andthe target client terminal are all sent by broadcasting. Packet loss ornetwork abnormal may appear in the transmission process, resulting inthat some broadcast proxy devices and/or some transit devices cannotreceive the notifications. Therefore, the flow control engine deviceneeds to regularly broadcast the status of all of the first clientterminals and the target client terminals to all of the broadcast proxydevices and the transit devices that maintain the target communicationchannel, so as to resolve the problem of status inconsistency broughtabout by accidental notification loss.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Further referring to FIG. 4, FIG. 4 is a schematic flowchart of anotherdata transmission method according to some embodiments of the presentdisclosure. The method may include:

S301: A transit device receives audio/video data sent by a target clientterminal that is in a target communication channel and has anaudio/video upstream authority.

Specifically, a transit device may receive audio/video data sent by atarget client terminal that is in a target communication channel and hasan audio/video upstream authority. The transit device may be a transitdevice in the network structure corresponding to FIG. 1. The targetclient terminal may be a client of a plurality of clients that isconnected to the transit device, is in the same target communicationchannel, and has an audio/video upstream authority. The targetcommunication channel is a client of at least one audio/video callchannel.

S302: The transit device splits the audio/video data into audio data andvideo data.

S303: The transit device sends the audio data to an audio mixing device,so that the audio mixing device mixes the audio data to obtain audiomixed data and forwards the audio mixed data to the transit device and abroadcast proxy device.

Specifically, the transit device sends the audio data to an audio mixingdevice, so that the audio mixing device mixes the audio data to obtainaudio mixed data and forwards the audio mixed data to the transit deviceand the broadcast proxy device. The audio mixing device also forwardsthe audio mixed data to the associated transit device. The associatedtransit device includes another transit device in the targetcommunication channel apart from the transit device.

S304: The transit device sends the video data to a transcoding device,so that the transcoding device processes the video data into a bitstream of at least one level of video quality and forwards the bitstream of at least one level of video quality to the transit device andthe broadcast proxy device.

Specifically, S303 and S304 may be performed simultaneously. The transitdevice sends the video data to the transcoding device, so that thetranscoding device processes the video data into a bit stream of atleast one level of video quality and forwards the bit stream of at leastone level of video quality to the transit device and the broadcast proxydevice. The transcoding device also forwards the bit stream of at leastone level of video quality to the associated transit device. The bitstream of at least one level of video quality may include a bit streamof a plurality of code rates or a bit stream of a plurality ofresolutions.

S305: The transit device forwards, in a downstream transmission modenotified by the flow control engine device, the bit stream of thecorresponding level of video quality and the audio mixed data to atleast one first client terminal.

Specifically, the transit device may forward, in a downstreamtransmission mode notified by the flow control engine device, the bitstream of the corresponding level of video quality and the audio mixeddata to the at least one first client terminal. The associated transitdevice may also forward, in a downstream transmission mode notified bythe flow control engine device, the bit stream of the correspondinglevel of video quality and the audio mixed data to the first clientterminal connected to the associated transit device. The downstreamtransmission mode notified by the flow control engine device to thetransit device and the associated transit device is determined accordingto network quality information of the at least one first client terminalcollected in advance. For example, a first client terminal A and a firstclient terminal B are connected to the transit device. If a networkcorresponding to the first client terminal A is relatively smooth, thecorresponding downstream transmission mode may be a bit stream of a highcode rate. In this case, the transit device forwards the bit stream of ahigh code rate and the audio mixed data to the first client terminal A.Meanwhile, if the quality of a network corresponding to the first clientterminal B is relatively poor, the corresponding downstream transmissionmode may be a bit stream of a low code rate. In this case, the transitdevice forwards the bit stream of a low code rate and the audio mixeddata to the first client terminal B.

S306: The broadcast proxy device forwards the bit stream of thecorresponding level of video quality and the audio mixed data to eachsecond client terminal according to network quality information of eachsecond client terminal of at least one second client terminal.

Specifically, S305 and S306 may be performed simultaneously. Thebroadcast proxy device forwards the bit stream of the correspondinglevel of video quality and the audio mixed data to each second clientterminal according to the network quality information of each secondclient terminal of the at least one second client terminal. The networkquality information of each second client terminal is regularlycollected by the broadcast proxy device. For example, a second clientterminal A and a second client terminal B are connected to the broadcastproxy device. If a network corresponding to the second client terminal Ais relatively smooth, the broadcast proxy device forwards a bit streamof a high code rate and the mixed data to the second client terminal A.Meanwhile, if the quality of a network corresponding to the secondclient terminal B is relatively poor, the broadcast proxy deviceforwards a bit stream of a low code rate and the audio mixed data to thesecond client terminal B. As the network quality information of all thesecond client terminals is reported to the broadcast proxy device andthe flow control engine device needs to collect only network qualityinformation of the first client terminal and the target client terminal,load of the flow control engine device can be further alleviated. Bymixing the audio data, a part of downstream traffic can be saved for theclients.

Optionally, after the transit device sends the audio data and the videodata to the transcoding device and the audio mixing device, the transitdevice may further send a recording and streaming request to thetranscoding device, so that the transcoding device acquires the audiomixed data, encapsulates the audio mixed data and the bit stream of atleast one level of video quality into streaming media information, andsends the streaming media information to a recording and storage serverand/or a content delivery network (CDN) according to the recording andstreaming request. The format of the streaming media information mayinclude TS, MP4, FLV, or the like. By means of connection to the CDN andthe storage server, the audio/video call service system of the presentdisclosure can go beyond the restriction of original real-time callservices, and can better serve services that require recording ofaudio/video data (for example, bank, customer service), and servicesthat are capable of tolerating time delay but required to be watched bymeans of a Web (for example, live broadcast and education).

By this embodiment of the present disclosure, the original real-timemulti-person audio and video call service system may still retain asmall room management mode, an upper limit supported by a single room isextended greatly by means of parallel extending, meanwhile impact on theexisting architecture is made the smallest, and the risks arecontrollable. In addition, by means of the functions of the audio mixingdevice and the transcoding device, the downstream channel qualitycontrol capability and the multi-client watching coverage and backendrecording capability can be further improved, so as to further guaranteestability of the large scale audio/video call service system.

Further referring to FIG. 5, FIG. 5 is a schematic flowchart of stillanother data transmission method according to some embodiments of thepresent disclosure. The method may include:

S401: A transit device receives audio/video data sent by a target clientterminal that is in a target communication channel and has anaudio/video upstream authority.

S402: The transit device forwards the audio/video data to at least onefirst client terminal that is in the target communication channel andhas an audio/video upstream authority, and to a broadcast proxy devicein the target communication channel, so that the broadcast proxy deviceforwards the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of each second client terminal of at least one second clientterminal.

The at least one second client terminal is a client terminal that isconnected to the broadcast proxy device, is in the target communicationchannel, and does not have an audio/video upstream authority. Thenetwork quality information of each second client terminal is collectedby the broadcast proxy device in advance.

The specific implementation manner of operation S401 and operation S402may be referred to in the description of the transit device in theforegoing embodiment corresponding to FIG. 2, or the description of thetransit device in the foregoing embodiment corresponding to FIG. 3, andis not further described herein.

Optionally, the transit device receives client change information sentby a flow control engine device when the audio/video upstream authorityof the target client terminal is canceled, or the first client terminalstarts to upload the audio/video data, or the changed second clientterminal starts to upload the audio/video data, the client changeinformation being state change information of a client terminal that hasan audio/video upstream authority.

The transit device forwards the client change information to the targetclient terminal, the at least one first client terminal, and the changedsecond client terminal.

The changed second client terminal is a second client terminal for whichan audio/video upstream authority is allocated.

The process of forwarding the client change information may specificallyrefer to S209 to S213 in the foregoing embodiment corresponding to FIG.3, and is not further described herein.

Optionally, the transit device maintains at least one audio/video callchannel, and stores a broadcast proxy device list respectivelycorresponding to each audio/video call channel of the at least oneaudio/video call channel.

The at least one audio/video call channel includes at least the targetcommunication channel, and the broadcast proxy device list includes anaddress of the broadcast proxy device.

Optionally, operation S402 may include:

The transit device splits the audio/video data into audio data and videodata.

The transit device sends the audio data to an audio mixing device, sothat the audio mixing device mixes the audio data to obtain audio mixeddata and forwards the audio mixed data to the transit device and thebroadcast proxy device.

The transit device sends the video data to a transcoding device, so thatthe transcoding device processes the video data into a bit stream of atleast one level of video quality and forwards the bit stream of at leastone level of video quality to the transit device and the broadcast proxydevice.

The transit device forwards, in a downstream transmission mode notifiedby the flow control engine device, the bit stream of the correspondinglevel of video quality and the audio mixed data to the at least onefirst client terminal.

The broadcast proxy device is a device configured to forward the bitstream of the corresponding level of video quality and the audio mixeddata to each second client terminal according to network qualityinformation of the second client terminal.

The specific process of forwarding, by the transit device, theaudio/video data by means of the audio mixing device and the transcodingdevice may refer to S302 to S306 in the foregoing embodimentcorresponding to FIG. 4, and is not further described herein.

Optionally, the transit device may further send a recording andstreaming request to the transcoding device, so that the transcodingdevice acquires the audio mixed data, encapsulates the audio mixed dataand the bit stream of at least one level of video quality into streamingmedia information, and sends the streaming media information to arecording and storage server and/or a content delivery network (CDN)according to the recording and streaming request.

Optionally, before operation S401, the transit device may receive afirst access request sent by the target client terminal, and completeconnection with the target client terminal according to the first accessrequest, the first access request being generated according to anaddress of the transit device allocated by a policy service device, andthe address of the transit device being allocated by the policy servicedevice when the policy service device detects that the target clientterminal has an audio/video upstream authority.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Further referring to FIG. 6, FIG. 6 is a schematic flowchart of stillanother data transmission method according to some embodiments of thepresent disclosure. The method may include

S501: A broadcast proxy device receives audio/video data sent by atransit device, the audio/video data being data sent to the transitdevice by a target client terminal that is in a target communicationchannel and has an audio/video upstream authority, and the broadcastproxy device being connected to at least one second client terminal thatis in the target communication channel and does not have an audio/videoupstream authority.

S502: The broadcast proxy device forwards the audio/video data to eachsecond client terminal in a corresponding downstream transmission modeaccording to network quality information of the second client terminal,the network quality information of each second client terminal beingcollected by the broadcast proxy device in advance.

The transit device is a device configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority and tothe broadcast proxy device in the target communication channel.

The specific implementation manner of operation S501 and operation S502may be referred to in the description of the broadcast proxy device inthe foregoing embodiment corresponding to FIG. 2, or the description ofthe broadcast proxy device in the foregoing embodiment corresponding toFIG. 3, and is not further described herein.

Optionally, the broadcast proxy device receives a redirectioninstruction sent by a flow control engine device when there is a secondclient terminal for which an audio/video upstream authority is allocatedamong the at least one second client terminal.

The broadcast proxy device transfers an access service of the changedsecond client terminal to the transit device in the target communicationchannel according to the redirection instruction.

The change process of the audio/video upstream authority of the secondclient terminal may specifically refer to S205 to S206 in the foregoingembodiment corresponding to FIG. 3, and is not further described herein.

Optionally, the broadcast proxy device reports to a flow control enginedevice a total quantity of second client terminals when a total quantityof the at least one second client terminal changes, so that the flowcontrol engine device calculates a total quantity of client terminals inthe target communication channel according to the reported totalquantity of second client terminals and a total quantity of the targetclient terminals and the at least one first client terminal.

The process of reporting the total quantity of second client terminalsmay specifically refer to S207 and S208 in the foregoing embodimentcorresponding to FIG. 3, and is not further described herein.

Optionally, the broadcast proxy device receives client changeinformation sent by the flow control engine device when the audio/videoupstream authority of the target client terminal is canceled, or thefirst client terminal starts to upload the audio/video data, or thechanged second client terminal starts to upload the audio/video data,the client change information being state change information of a clientterminal that has an audio/video upstream authority.

The broadcast proxy device forwards the client change information to theat least one second client terminal.

The process of forwarding the client change information may specificallyrefer to S209 to S213 in the foregoing embodiment corresponding to FIG.3, and is not further described herein.

Optionally, when the transit device splits the audio/video data intoaudio data and video data rather than directly forward the audio/videodata to the broadcast proxy device, the transit device may send theaudio data to an audio mixing device, so that the audio mixing devicemixes the audio data to obtain audio mixed data and forwards the audiomixed data to the transit device and the broadcast proxy device. Thetransit device may also send the video data to a transcoding device, sothat the transcoding device processes the video data into a bit streamof at least one level of video quality and forwards the bit stream of atleast one level of video quality to the transit device and the broadcastproxy device. After the broadcast proxy device receives the audio mixeddata and the bit stream of at least one level of video quality, thebroadcast proxy device may forward the bit stream of the correspondinglevel of video quality and the audio mixed data to each second clientterminal according to the network quality information of each secondclient terminal of the at least one second client terminal. The transitdevice may also forward, in a downstream transmission mode notified bythe flow control engine device, the bit stream of the correspondinglevel of video quality and the audio mixed data to the at least onefirst client terminal.

Optionally, before operation S501, the broadcast proxy device mayreceive a second access request sent by each second client terminal andcomplete connection with each second client terminal according to thesecond access request, the second access request being generated by eachsecond client terminal according to an address of the broadcast proxydevice allocated by a policy service device, and the address of thebroadcast proxy device being allocated by the policy service device whenthe policy service device detects that each second client terminal doesnot have an audio/video upstream authority.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Referring to FIG. 7, FIG. 7 is a schematic structural diagram of atransit device according to some embodiments of the present disclosure.The transit device may include: a forwarding receiving module 11 and aforwarding sending module 12.

The forwarding receiving module 11 is configured to receive audio/videodata sent by a target client terminal that is in a target communicationchannel and has an audio/video upstream authority.

Specifically, the forwarding receiving module 11 may receive theaudio/video data sent by the target client terminal that is in thetarget communication channel and has an audio/video upstream authority.The target client terminal may be a client of a plurality of clientsthat is connected to the transit device, is in the target communicationchannel, and has an audio/video upstream authority. The targetcommunication channel is a client of at least one audio/video callchannel.

The forwarding sending module 12 is configured to forward theaudio/video data to at least one first client terminal that is in thetarget communication channel and has an audio/video upstream authority,and to a broadcast proxy device in the target communication channel, sothat the broadcast proxy device forwards the audio/video data to eachsecond client terminal in a corresponding downstream transmission modeaccording to network quality information of each second client terminalof at least one second client terminal.

Specifically, after the forwarding receiving module 11 receives theaudio/video data, the forwarding sending module 12 may forward theaudio/video data to at least one first client terminal that is in thetarget communication channel and has an audio/video upstream authority.The process of forwarding, by the forwarding sending module 12, theaudio/video data to the at least one first client terminal specificallyincludes: forwarding, by the forwarding sending module 12 and in adownstream transmission mode notified by the flow control engine device,the audio/video data to the at least one first client terminal that isconnected to the transit device, is in the target communication channel,and has an audio/video upstream authority, and to an associated transitdevice, so that the associated transit device forwards the audio/videodata to at least one first client terminal that is connected to theassociated transit device, is in the target communication channel, andhas an audio/video upstream authority, the associated transit deviceincluding another transit device in the target communication channelapart from the transit device. The forwarding sending module 12 alsoforwards the received audio/video data to a broadcast proxy device inthe target communication channel. At least one second client terminalthat is in the target communication channel and does not have anaudio/video upstream authority is connected to the broadcast proxydevice. The downstream transmission mode notified by the flow controlengine device to the transit device and the associated transit device isdetermined according to network quality information of the at least onefirst client terminal collected in advance. For example, the forwardingsending module 12 and the associated transit device may directly forwardcomplete audio/video data to a first client terminal in a relativelysmooth network, or may also forward the audio/video data to a firstclient terminal in a network having weak signals by means of frame skip.The network quality information may include statistics information suchas a packet loss rate and delay information. There may be a plurality ofthe associated transit devices and a plurality of the broadcast proxydevices.

After the forwarding sending module 12 sends the audio/video data to thebroadcast proxy devices in the target communication channel, eachbroadcast proxy device in the target communication channel mayrespectively send, in a corresponding downstream transmission modeaccording to the network quality information corresponding to eachsecond client terminal, the audio/video data to each second clientterminal connected to the broadcast proxy device. For example, it isassumed that a second client terminal A and a second client terminal Bare connected to one broadcast proxy device in the target communicationchannel. If the broadcast proxy device senses that the network of thesecond client terminal A is relatively smooth, the broadcast proxydevice may forward complete audio/video data to the second clientterminal A. Meanwhile, if the broadcast proxy device senses that thenetwork of the second client terminal B is not stable, the broadcastproxy device may forward audio/video data to the second client terminalB by means of frame skip. The broadcast proxy device may collect networkquality information of each second client terminal regularly. As thenetwork quality information of each second client terminal is reportedto the broadcast proxy device and the flow control engine device needsto collect only network quality information of the first client terminaland the target client terminal, load of the flow control engine devicecan be further alleviated.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Further referring to FIG. 8, FIG. 8 is a schematic structural diagram ofanother transit device according to some embodiments of the presentdisclosure. The transit device may include the forwarding receivingmodule 11 and the forwarding sending module 12 in the foregoingembodiment corresponding to FIG. 7. Further, the transit device may alsoinclude a maintenance and storage module 13 and a request sending module14.

The forwarding sending module 12 includes a splitting unit 121 and asending unit 122.

The forwarding receiving module 11 is further configured to receiveclient change information sent by a flow control engine device when theaudio/video upstream authority of the target client terminal iscanceled, or the first client terminal starts to upload the audio/videodata, or the changed second client terminal starts to upload theaudio/video data, the client change information being state changeinformation of a client terminal having an audio/video upstreamauthority.

The forwarding sending module 12 is further configured to forward theclient change information to the target client terminal, the at leastone first client terminal, and the changed second client terminal.

The changed second client terminal is a second client terminal for whichan audio/video upstream authority is allocated.

The process of forwarding the client change information performed by theforwarding receiving module 11 and the forwarding sending module 12 mayspecifically refer to S209 to S213 in the foregoing embodimentcorresponding to FIG. 3, and is not further described herein.

The maintenance and storage module 13 is configured to maintain at leastone audio/video call channel, and store a broadcast proxy device listrespectively corresponding to each audio/video call channel of the atleast one audio/video call channel, where the at least one audio/videocall channel includes at least the target communication channel, and thebroadcast proxy device list includes an address of the broadcast proxydevice.

The splitting unit 121 is configured to split the audio/video data intoaudio data and video data.

The sending unit 122 is configured to send the audio data to an audiomixing device, so that the audio mixing device mixes the audio data toobtain audio mixed data and forwards the audio mixed data to the transitdevice and the broadcast proxy device.

The sending unit 122 is further configured to send the video data to atranscoding device, so that the transcoding device processes the videodata into a bit stream of at least one level of video quality andforwards the bit stream of at least one level of video quality to thetransit device and the broadcast proxy device.

The sending unit 122 is further configured to forward, in a downstreamtransmission mode notified by the flow control engine device, the bitstream of the corresponding level of video quality and the audio mixeddata to the at least one first client terminal.

The broadcast proxy device is a device configured to forward the bitstream of the corresponding level of video quality and the audio mixeddata to each second client terminal according to network qualityinformation of the second client terminal.

The specific process of forwarding, by the splitting unit 121 and thesending unit 122, the audio/video data by means of the audio mixingdevice and the transcoding device may refer to S302 to S306 in theforegoing embodiment corresponding to FIG. 4, and is not furtherdescribed herein.

The request sending module 14 is configured to send a recording andstreaming request to the transcoding device, so that the transcodingdevice acquires the audio mixed data, encapsulates the audio mixed dataand the bit stream of at least one level of video quality into streamingmedia information, and sends the streaming media information to arecording and storage server and/or a content delivery network (CDN)according to the recording and streaming request.

Optionally, before receiving the audio/video data sent by the targetclient terminal that is in the target communication channel and has anaudio/video upstream authority, the forwarding receiving module 11 isfurther configured to receive a first access request sent by the targetclient terminal and complete connection with the target client terminalaccording to the first access request. The first access request isgenerated by the target client terminal according to an address of thetransit device allocated by a policy service device, and the address ofthe transit device is allocated by the policy service device when thepolicy service device detects that the target client terminal has anaudio/video upstream authority. Similarly, the access mode of the atleast one first client terminal is the same as the access mode of thetarget client terminal.

By this embodiment of the present disclosure, the original real-timemulti-person audio and video call service system may still retain asmall room management mode, an upper limit supported by a single room isextended greatly by means of parallel extending, meanwhile impact on theexisting architecture is made the smallest, and the risks arecontrollable. In addition, by means of the functions of the audio mixingdevice and the transcoding device, the downstream channel qualitycontrol capability and the multi-client watching coverage and backendrecording capability can be further improved, so as to further guaranteestability of the large scale audio/video call service system.

Further referring to FIG. 9, FIG. 9 is a schematic structural diagram ofstill another transit device according to some embodiments of thepresent disclosure. As shown in FIG. 9, the transit device may include:at least one processor 1001, for example, a CPU, at least one networkinterface 1004, a user interface 1003, a memory 1005, and at least onecommunication bus 1002. The communication bus 1002 is configured toimplement connection and communication among the components. The userinterface 1003 may include a display or a keyboard. Optionally, the userinterface 1003 may also include a standard wired interface or wirelessinterface. Optionally, the network interface 1004 may include a standardwired interface or wireless interface (for example, a WiFi interface).The memory 1005 may be a high-speed RAM, or may alternatively be anon-volatile memory, for example, at least one magnetic disk memory.Optionally, the memory 1005 may also be at least one storage device faraway from the processor 1001. As shown in FIG. 9, the memory 1005 as acomputer storage medium may include an operating system, a networkcommunication module, a subscriber interface module, and a devicecontrol application.

In the transit device shown in FIG. 9, the network interface 1004 ismainly configured to connect a broadcast proxy device, a flow controlengine device, a target client terminal, and a first client terminal.The user interface 1003 is mainly configured to provide an interface forinput by a user and acquire data output by the user. The processor 1001may be configured to invoke a device control application stored in thememory 1005, and specifically perform the following operations:

receiving audio/video data sent by a target client terminal that is in atarget communication channel and has an audio/video upstream authority;and

forwarding the audio/video data to at least one first client terminalthat is in the target communication channel and has an audio/videoupstream authority, and to a broadcast proxy device in the targetcommunication channel, so that the broadcast proxy device forwards theaudio/video data to each second client terminal in a correspondingdownstream transmission mode according to network quality information ofeach second client terminal of at least one second client terminal.

The at least one second client terminal is a client terminal that isconnected to the broadcast proxy device and in the target communicationchannel and does not have an audio/video upstream authority.

The network quality information of each second client terminal iscollected by the broadcast proxy device in advance.

In an embodiment, the processor 1001 further performs the followingoperations:

receiving client change information sent by a flow control engine devicewhen the audio/video upstream authority of the target client terminal iscanceled, or the first client terminal starts to upload the audio/videodata, or the changed second client terminal starts to upload theaudio/video data, the client change information being state changeinformation of a client terminal having an audio/video upstreamauthority; and

forwarding the client change information to the target client terminal,the at least one first client terminal, and the changed second clientterminal.

The changed second client terminal is a second client terminal for whichan audio/video upstream authority is allocated.

In an embodiment, the processor 1001 further performs the followingoperation:

maintaining at least one audio/video call channel and storing abroadcast proxy device list respectively corresponding to eachaudio/video call channel of the at least one audio/video call channel.

The at least one audio/video call channel includes at least the targetcommunication channel, and the broadcast proxy device list includes anaddress of the broadcast proxy device.

In an embodiment, when forwarding the audio/video data to at least onefirst client terminal that is in the target communication channel andhas an audio/video upstream authority, and to a broadcast proxy devicein the target communication channel, so that the broadcast proxy deviceforwards the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of each second client terminal of at least one second clientterminal, the processor 1001 specifically performs the followingoperations:

splitting the audio/video data into audio data and video data;

sending the audio data to an audio mixing device, so that the audiomixing device mixes the audio data to obtain audio mixed data andforwards the audio mixed data to the transit device and the broadcastproxy device;

sending the video data to a transcoding device, so that the transcodingdevice processes the video data into a bit stream of at least one levelof video quality and forwards the bit stream of at least one level ofvideo quality to the transit device and the broadcast proxy device; and

forwarding, in a downstream transmission mode notified by the flowcontrol engine device, the bit stream of the corresponding level ofvideo quality and the audio mixed data to the at least one first clientterminal.

The broadcast proxy device is a device configured to forward the bitstream of the corresponding level of video quality and the audio mixeddata to each second client terminal according to network qualityinformation of the second client terminal.

In an embodiment, the processor 1001 further performs the followingoperation:

sending a recording and streaming request to the transcoding device, sothat the transcoding device acquires the audio mixed data, encapsulatesthe audio mixed data and the bit stream of at least one level of videoquality into streaming media information, and sends the streaming mediainformation to a recording and storage server and/or a content deliverynetwork (CDN) according to the recording and streaming request.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Referring to FIG. 10, FIG. 10 is a schematic structural diagram of abroadcast proxy device according to some embodiments of the presentdisclosure. The broadcast proxy device may include a proxy receivingmodule 21 and a proxy sending module 22.

The proxy receiving module 21 is configured to receive audio/video datasent by a transit device, the audio/video data being data sent to thetransit device by a target client terminal that is in a targetcommunication channel and has an audio/video upstream authority, and thebroadcast proxy device being connected to at least one second clientterminal that is in the target communication channel and does not havean audio/video upstream authority.

The proxy sending module 22 is configured to forward the audio/videodata to each second client terminal in a corresponding downstreamtransmission mode according to network quality information of the secondclient terminal, the network quality information of each second clientterminal being collected by the broadcast proxy device in advance.

The transit device is a device configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority and tothe broadcast proxy device in the target communication channel.

The specific implementation manner of the proxy receiving module 21 andthe proxy sending module 22 may refer to the description of thebroadcast proxy device in the foregoing embodiment corresponding to FIG.2 or the description of the broadcast proxy device in the foregoingembodiment corresponding to FIG. 3, and is not further described herein.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Referring to FIG. 11, FIG. 11 is a schematic structural diagram ofanother broadcast proxy device according to some embodiments of thepresent disclosure. The broadcast proxy device may include the proxyreceiving module 21 and the proxy sending module 22 in the foregoingembodiment corresponding to FIG. 10. Further, the broadcast proxy devicemay also include: an instruction receiving module 23, a transfer module24, and a quantity reporting module 25.

The instruction receiving module 23 is configured to receive aredirection instruction sent by a flow control engine device when thereis a second client terminal for which an audio/video upstream authorityis allocated among the at least one second client terminal.

The transfer module 24 is configured to transfer an access service ofthe changed second client terminal to the transit device in the targetcommunication channel according to the redirection instruction.

The quantity reporting module 25 is configured to report to the flowcontrol engine device a total quantity of second client terminals afterchange if a total quantity of the at least one second client terminalchanges, so that the flow control engine device calculates a totalquantity of client terminals in the target communication channelaccording to the reported total quantity of second client terminals anda total quantity of the target client terminals and the at least onefirst client terminal.

The specific implementation manner of the instruction receiving module23 and the transfer module 24 may refer to S205 and S206 in theforegoing embodiment corresponding to FIG. 3, and is not furtherdescribed herein. The specific implementation manner of the quantityreporting module 25 may refer to S207 and S208 in the foregoingembodiment corresponding to FIG. 3, and is not further described herein.

Optionally, the proxy receiving module 21 is further configured toreceive client change information sent by the flow control engine devicewhen the audio/video upstream authority of the target client terminal iscanceled, or the first client terminal starts to upload the audio/videodata, or the changed second client terminal starts to upload theaudio/video data, the client change information being state changeinformation of a client terminal having an audio/video upstreamauthority.

The proxy sending module 22 is further configured to forward the clientchange information to the at least one second client terminal.

The process of forwarding the client change information performed by theproxy receiving module 21 and the proxy sending module 22 mayspecifically refer to S209 to S213 in the foregoing embodimentcorresponding to FIG. 3, and is not further described herein.

Optionally, when the transit device splits the audio/video data intoaudio data and video data rather than directly forward the audio/videodata to the broadcast proxy device, the transit device may send theaudio data to an audio mixing device, so that the audio mixing devicemixes the audio data to obtain audio mixed data and forwards the audiomixed data to the transit device and the broadcast proxy device. Thetransit device may also send the video data to a transcoding device, sothat the transcoding device processes the video data into a bit streamof at least one level of video quality and forwards the bit stream of atleast one level of video quality to the transit device and the broadcastproxy device. After the proxy receiving module 21 receives the audiomixed data and the bit stream of at least one level of video quality,the proxy sending module 22 may forward the bit stream of thecorresponding level of video quality and the audio mixed data to eachsecond client terminal according to the network quality information ofeach second client terminal of the at least one second client terminal.The transit device may also forward, in a downstream transmission modenotified by the flow control engine device, the bit stream of thecorresponding level of video quality and the audio mixed data to the atleast one first client terminal.

Optionally, before the proxy receiving module 21 receives theaudio/video data sent by the transit device, the proxy receiving module21 may also receive a second access request sent by each second clientterminal and complete connection with each second client terminalaccording to the second access request, the second access request beinggenerated by each second client terminal according to an address of thebroadcast proxy device allocated by a policy service device, and theaddress of the broadcast proxy device being allocated by the policyservice device when the policy service device detects that each secondclient terminal does not have an audio/video upstream authority.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Further referring to FIG. 12, FIG. 12 is a schematic structural diagramof still another broadcast proxy device according to some embodiments ofthe present disclosure. As shown in FIG. 12, the broadcast proxy devicemay include: at least one processor 2001, for example, a CPU, at leastone network interface 2004, a user interface 2003, a memory 2005, and atleast one communication bus 2002. The communication bus 2002 isconfigured to implement connection and communication among thecomponents. The user interface 2003 may include a display or a keyboard.Optionally, the user interface 2003 may also include a standard wiredinterface or wireless interface. Optionally, the network interface 2004may include a standard wired interface or wireless interface (forexample, a WiFi interface). The memory 2005 may be a high-speed RAM, ormay alternatively be a non-volatile memory, for example, at least onemagnetic disk memory. Optionally, the memory 2005 may also be at leastone storage device far away from the processor 2001. As shown in FIG.12, the memory 2005 as a computer storage medium may include anoperating system, a network communication module, a subscriber interfacemodule, and a device control application.

In the broadcast proxy device shown in FIG. 12, the network interface2004 is mainly configured to connect a transit device, a flow controlengine device, and a second client terminal. The user interface 2003 ismainly configured to provide an interface for input by a user andacquire data output by the user. The processor 2001 may be configured toinvoke a device control application stored in the memory 2005, andspecifically perform the following operations:

receiving audio/video data sent by a transit device, the audio/videodata being data sent to the transit device by a target client terminalthat is in a target communication channel and has an audio/videoupstream authority, and the broadcast proxy device being connected to atleast one second client terminal that is in the target communicationchannel and does not have an audio/video upstream authority; and

forwarding the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of the second client terminal, the network qualityinformation of each second client terminal being collected by thebroadcast proxy device in advance.

The transit device is a device configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority and tothe broadcast proxy device in the target communication channel.

In an embodiment, the processor 2001 further performs the followingoperations:

receiving a redirection instruction sent by the flow control enginedevice when there is a second client terminal for which an audio/videoupstream authority is allocated among the at least one second clientterminal; and

transferring an access service of the changed second client terminal tothe transit device in the target communication channel according to theredirection instruction.

In an embodiment, the processor 2001 further performs the followingoperation:

reporting to the flow control engine device a total quantity of secondclient terminals after change if a total quantity of the at least onesecond client terminal changes, so that the flow control engine devicecalculates a total quantity of client terminals in the targetcommunication channel according to the reported total quantity of secondclient terminals and a total quantity of the target client terminals andthe at least one first client terminal.

In an embodiment, the processor 2001 further performs the followingoperations:

receiving client change information sent by a flow control engine devicewhen the audio/video upstream authority of the target client terminal iscanceled, or the first client terminal starts to upload the audio/videodata, or the changed second client terminal starts to upload theaudio/video data, the client change information being state changeinformation of a client terminal having an audio/video upstreamauthority; and

forwarding the client change information to the at least one secondclient terminal.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device, so that when the transit device receivesaudio/video data sent by the target client terminal, the transit devicemay respectively forward the audio/video data to each first clientterminal and the broadcast proxy device, and the broadcast proxy devicefurther forwards the obtained audio/video data to the second clientterminals. Since the second client terminals are all managed by thebroadcast proxy device, load of a network control policy system and adata forwarding system can be greatly reduced when a quantity of thesecond client terminals becomes relatively huge, thereby guaranteeingstability of a super large scale audio/video call service system.

Referring to FIG. 13, FIG. 13 is a schematic structural diagram of adata transmission system according to some embodiments of the presentdisclosure. The system may include a transit device 100 and a broadcastproxy device 200.

The transit device 100 is configured to receive audio/video data sent bya target client terminal that is in a target communication channel andhas an audio/video upstream authority.

The transit device 100 is further configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority, and toa broadcast proxy device 200 in the target communication channel, thebroadcast proxy device being connected to at least one second clientterminal that is in the target communication channel and does not havean audio/video upstream authority 200.

The broadcast proxy device 200 is configured to forward the audio/videodata to each second client terminal in a corresponding downstreamtransmission mode according to network quality information of the secondclient terminal, the network quality information of each second clientterminal being collected by the broadcast proxy device 200 in advance.

The broadcast proxy device 200 is further configured to receive aredirection instruction sent by a flow control engine device when thereis a second client terminal for which an audio/video upstream authorityis allocated among the at least one second client terminal.

The broadcast proxy device 200 is further configured to transfer anaccess service of the changed second client terminal to the transitdevice 100 in the target communication channel according to theredirection instruction.

The broadcast proxy device 200 is further configured to report to theflow control engine device a total quantity of second client terminalsafter change if a total quantity of the at least one second clientterminal changes, so that the flow control engine device calculates atotal quantity of client terminals in the target communication channelaccording to the reported total quantity of second client terminals anda total quantity of the target client terminals and the at least onefirst client terminal.

The broadcast proxy device 200 and the transit device 100 each arefurther configured to receive client change information sent by the flowcontrol engine device when the audio/video upstream authority of thetarget client terminal is canceled, or the first client terminal startsto upload the audio/video data, or the changed second client terminalstarts to upload the audio/video data, the client change informationbeing state change information of a client terminal having anaudio/video upstream authority.

The transit device 100 is further configured to forward the clientchange information to the target client terminal, the at least one firstclient terminal, and the changed second client terminal.

The broadcast proxy device 200 is further configured to forwarding theclient change information to the at least one second client terminal.

The transit device 100 is further configured to maintain at least oneaudio/video call channel and store a broadcast proxy device listrespectively corresponding to each audio/video call channel of the atleast one audio/video call channel.

The at least one audio/video call channel includes at least the targetcommunication channel, and the broadcast proxy device list includes anaddress of the broadcast proxy device.

When forwarding the audio/video data to at least one first clientterminal that is in the target communication channel and has anaudio/video upstream authority and to the broadcast proxy device 200 inthe target communication channel, the transit device 100 is specificallyconfigured to split the audio/video data into audio data and video data,and send the audio data to an audio mixing device, so that the audiomixing device mixes the audio data to obtain audio mixed data andforwards the audio mixed data to the transit device 100 and thebroadcast proxy device 200; the transit device 100 is further configuredto send the video data to a transcoding device, so that the transcodingdevice processes the video data into a bit stream of at least one levelof video quality and forwards the bit stream of at least one level ofvideo quality to the transit device 100 and the broadcast proxy device200; and the transit device 100 is further configured to forward, in adownstream transmission mode notified by the flow control engine device,the bit stream of the corresponding level of video quality and the audiomixed data to the at least one first client terminal.

When forwarding the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of the second client terminal, the broadcast proxy device200 is specifically configured to forward the bit stream of thecorresponding level of video quality and the audio mixed data to eachsecond client terminal according to the network quality information ofeach second client terminal of the at least one second client terminal.

The transit device 100 is further configured to send a recording andstreaming request to the transcoding device, so that the transcodingdevice acquires the audio mixed data, encapsulates the audio mixed dataand the bit stream of at least one level of video quality into streamingmedia information, and sends the streaming media information to arecording and storage server and/or a content delivery network (CDN)according to the recording and streaming request.

The transit device 100 is further configured to receive a first accessrequest sent by the target client terminal and complete connection withthe target client terminal according to the first access request, thefirst access request being generated by the target client terminalaccording to an address of the transit device allocated by a policyservice device, and the address of the transit device being allocated bythe policy service device when the policy service device detects thatthe target client terminal has an audio/video upstream authority.

The broadcast proxy device 200 is further configured to receive a secondaccess request sent by each second client terminal and completeconnection with each second client terminal according to the secondaccess request, the second access request being generated by each secondclient terminal according to an address of the broadcast proxy deviceallocated by the policy service device, and the address of the broadcastproxy device being allocated by the policy service device when thepolicy service device detects that each second client terminal does nothave an audio/video upstream authority.

In the embodiments of the present disclosure, a plurality of firstclient terminals that has an audio/video upstream authority and a targetclient terminal that has an audio/video upstream authority are connectedto a transit device 100, and a plurality of second client terminals thatdoes not have an audio/video upstream authority is connected to abroadcast proxy device 200, so that when the transit device 100 receivesaudio/video data sent by the target client terminal, the transit device100 may respectively forward the audio/video data to each first clientterminal and the broadcast proxy device 200, and the broadcast proxydevice 200 further forwards the obtained audio/video data to the secondclient terminals. Since the second client terminals are all managed bythe broadcast proxy device 200, load of a network control policy systemand a data forwarding system can be greatly reduced when a quantity ofthe second client terminals becomes relatively huge, therebyguaranteeing stability of a super large scale audio/video call servicesystem.

A person of ordinary skill in the art may understand that all or some ofthe operations of the foregoing embodiments may be implemented by acomputer program instructing relevant hardware. The program may bestored in a computer readable storage medium. The program, when beingexecuted, may include the operations of the embodiments in the methods.The storage medium may be a magnetic disk, an optic disc, a read-onlymemory (ROM), a random access memory (RAM), or the like.

The above descriptions are merely preferred embodiments of the presentdisclosure, and certainly cannot be used to limit the scope of theclaims of the present disclosure. Equivalent changes made according tothe claims of the present disclosure still fall within the scope of thepresent disclosure.

What is claimed is:
 1. A data transmission method performed at a datatransmission system including a transit device and a broadcast proxydevice that is communicatively coupled to the transit device, eachdevice having one or more processors and memory storing one or moreprograms to be executed by the one or more processors, the methodcomprising: receiving, by the broadcast proxy device, audio/video datasent by the transit device, the audio/video data being data sent to thetransit device by a target client terminal that is in a targetcommunication channel and has an audio/video upstream authority, and atleast one second client terminal that is in the target communicationchannel and does not have an audio/video upstream authority beingconnected to the broadcast proxy device; forwarding, by the broadcastproxy device, the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of the second client terminal of the at least one secondclient terminal, the network quality information of the second clientterminal being collected by the broadcast proxy device in advance; andthe transit device being a device configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority and tothe broadcast proxy device in the target communication channel.
 2. Themethod according to claim 1, further comprising: receiving, by thebroadcast proxy device, a redirection instruction sent by a flow controlengine device when there is a changed second client for which anaudio/video upstream authority is allocated among the at least onesecond client terminal.
 3. The method according to claim 2, furthercomprising: receiving, by the broadcast proxy device, client changeinformation sent by the flow control engine device when the audio/videoupstream authority of the target client terminal is canceled, or thefirst client starts to upload the audio/video data, or the changedsecond client starts to upload the audio/video data, the client changeinformation being state change information of a client that has anaudio/video upstream authority; and forwarding, by the broadcast proxydevice, the client change information to the at least one second clientterminal.
 4. The method according to claim 1, further comprising:transferring, by the broadcast proxy device, an access service of thechanged second client to the transit device in the target communicationchannel according to the redirection instruction.
 5. The methodaccording to claim 1, further comprising: forwarding, by the broadcastproxy device, the bit stream of the corresponding level of video qualityand the audio mixed data to each second client terminal according tonetwork quality information of the second client terminal.
 6. The methodaccording to claim 1, further comprising: before receiving, by thebroadcast proxy device, audio/video data sent by the transit device, theaudio/video data being data sent to the transit device by a targetclient terminal that is in a target communication channel and has anaudio/video upstream authority: receiving, by the transit device, afirst access request sent by the target client terminal, and completing,by the transit device, connection with the target client terminalaccording to the first access request, the first access request beinggenerated by the target client terminal according to an address of thetransit device allocated by a policy service device, and the address ofthe transit device being allocated by the policy service device when thepolicy service device detects that the target client terminal has anaudio/video upstream authority; and receiving, by the broadcast proxydevice, a second access request sent by each second client terminal, andcompleting, by the broadcast proxy device, connection with each secondclient terminal according to the second access request, the secondaccess request being generated by each second client terminal accordingto an address of the broadcast proxy device allocated by the policyservice device, and the address of the broadcast proxy device beingallocated by the policy service device when the policy service devicedetects that each second client terminal does not have an audio/videoupstream authority.
 7. The method according to claim 1, furthercomprising: reporting, by the broadcast proxy device, to a flow controlengine device a total quantity of second clients after change if a totalquantity of the at least one second client terminal changes, so that theflow control engine device calculates a total quantity of clients in thetarget communication channel according to the reported total quantity ofsecond clients and a statistic total quantity of the target clientterminals and the at least one first client terminal.
 8. A datatransmission system including a transit device and a broadcast proxydevice that is communicatively coupled to the transit device, eachdevice having one or more processors, memory and one or more programsstored in the memory that, when executed by the one or more processors,cause the data transmission system to perform a plurality of operationsincluding: receiving, by the broadcast proxy device, audio/video datasent by the transit device, the audio/video data being data sent to thetransit device by a target client terminal that is in a targetcommunication channel and has an audio/video upstream authority, and atleast one second client terminal that is in the target communicationchannel and does not have an audio/video upstream authority beingconnected to the broadcast proxy device; forwarding, by the broadcastproxy device, the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of the second client terminal of the at least one secondclient terminal, the network quality information of the second clientterminal being collected by the broadcast proxy device in advance; andthe transit device being a device configured to forward the audio/videodata to at least one first client terminal that is in the targetcommunication channel and has an audio/video upstream authority and tothe broadcast proxy device in the target communication channel.
 9. Thedata transmission system according to claim 8, wherein the plurality ofoperations further comprise: receiving, by the broadcast proxy device, aredirection instruction sent by a flow control engine device when thereis a changed second client for which an audio/video upstream authorityis allocated among the at least one second client terminal.
 10. The datatransmission system according to claim 9, wherein the plurality ofoperations further comprise: receiving, by the broadcast proxy device,client change information sent by the flow control engine device whenthe audio/video upstream authority of the target client terminal iscanceled, or the first client starts to upload the audio/video data, orthe changed second client starts to upload the audio/video data, theclient change information being state change information of a clientthat has an audio/video upstream authority; and forwarding, by thebroadcast proxy device, the client change information to the at leastone second client terminal.
 11. The data transmission system accordingto claim 8, wherein the plurality of operations further comprise:transferring, by the broadcast proxy device, an access service of thechanged second client to the transit device in the target communicationchannel according to the redirection instruction.
 12. The datatransmission system according to claim 8, wherein the plurality ofoperations further comprise: forwarding, by the broadcast proxy device,the bit stream of the corresponding level of video quality and the audiomixed data to each second client terminal according to network qualityinformation of the second client terminal.
 13. The data transmissionsystem according to claim 8, wherein the plurality of operations furthercomprise: before receiving, by the broadcast proxy device, audio/videodata sent by the transit device, the audio/video data being data sent tothe transit device by a target client terminal that is in a targetcommunication channel and has an audio/video upstream authority:receiving, by the transit device, a first access request sent by thetarget client terminal, and completing, by the transit device,connection with the target client terminal according to the first accessrequest, the first access request being generated by the target clientterminal according to an address of the transit device allocated by apolicy service device, and the address of the transit device beingallocated by the policy service device when the policy service devicedetects that the target client terminal has an audio/video upstreamauthority; and receiving, by the broadcast proxy device, a second accessrequest sent by each second client terminal, and completing, by thebroadcast proxy device, connection with each second client terminalaccording to the second access request, the second access request beinggenerated by each second client terminal according to an address of thebroadcast proxy device allocated by the policy service device, and theaddress of the broadcast proxy device being allocated by the policyservice device when the policy service device detects that each secondclient terminal does not have an audio/video upstream authority.
 14. Thedata transmission system according to claim 8, wherein the plurality ofoperations further comprise: reporting, by the broadcast proxy device,to a flow control engine device a total quantity of second clients afterchange if a total quantity of the at least one second client terminalchanges, so that the flow control engine device calculates a totalquantity of clients in the target communication channel according to thereported total quantity of second clients and a statistic total quantityof the target client terminals and the at least one first clientterminal.
 15. A non-transitory computer readable storage medium storingone or more programs, wherein the one or more programs, when executed bya data transmission system comprising a transit device and a broadcastproxy device that is communicatively coupled to the transit device,cause the data transmission system to perform a plurality of operationsincluding: receiving, by the transit device, audio/video data sent by atarget client terminal that is in a target communication channel and hasan audio/video upstream authority; forwarding, by the transit device,the audio/video data to at least one first client terminal that is inthe target communication channel and has an audio/video upstreamauthority; forwarding, by the transit device, the audio/video data tothe broadcast proxy device in the target communication channel, thebroadcast proxy device being connected to at least one second clientterminal that is in the target communication channel and does not havean audio/video upstream authority; and forwarding, by the broadcastproxy device, the audio/video data to each second client terminal in acorresponding downstream transmission mode according to network qualityinformation of the second client terminal, the network qualityinformation of each second client terminal being collected by thebroadcast proxy device in advance. receiving, by the broadcast proxydevice, audio/video data sent by the transit device, the audio/videodata being data sent to the transit device by a target client terminalthat is in a target communication channel and has an audio/videoupstream authority, and at least one second client terminal that is inthe target communication channel and does not have an audio/videoupstream authority being connected to the broadcast proxy device;forwarding, by the broadcast proxy device, the audio/video data to eachsecond client terminal in a corresponding downstream transmission modeaccording to network quality information of the second client terminalof the at least one second client terminal, the network qualityinformation of the second client terminal being collected by thebroadcast proxy device in advance; and the transit device being a deviceconfigured to forward the audio/video data to at least one first clientterminal that is in the target communication channel and has anaudio/video upstream authority and to the broadcast proxy device in thetarget communication channel.
 16. The non-transitory computer readablestorage medium according to claim 15, wherein the plurality ofoperations further comprise: receiving, by the broadcast proxy device, aredirection instruction sent by a flow control engine device when thereis a changed second client for which an audio/video upstream authorityis allocated among the at least one second client terminal.
 17. Thenon-transitory computer readable storage medium according to claim 16,wherein the plurality of operations further comprise: receiving, by thebroadcast proxy device, client change information sent by the flowcontrol engine device when the audio/video upstream authority of thetarget client terminal is canceled, or the first client starts to uploadthe audio/video data, or the changed second client starts to upload theaudio/video data, the client change information being state changeinformation of a client that has an audio/video upstream authority; andforwarding, by the broadcast proxy device, the client change informationto the at least one second client terminal.
 18. The non-transitorycomputer readable storage medium according to claim 15, wherein theplurality of operations further comprise: transferring, by the broadcastproxy device, an access service of the changed second client to thetransit device in the target communication channel according to theredirection instruction.
 19. The non-transitory computer readablestorage medium according to claim 15, wherein the plurality ofoperations further comprise: forwarding, by the broadcast proxy device,the bit stream of the corresponding level of video quality and the audiomixed data to each second client terminal according to network qualityinformation of the second client terminal.
 20. The non-transitorycomputer readable storage medium according to claim 15, wherein theplurality of operations further comprise: reporting, by the broadcastproxy device, to a flow control engine device a total quantity of secondclients after change if a total quantity of the at least one secondclient terminal changes, so that the flow control engine devicecalculates a total quantity of clients in the target communicationchannel according to the reported total quantity of second clients and astatistic total quantity of the target client terminals and the at leastone first client terminal.